Mindfulness-based interventions, such as mindfulness-based cognitive therapy (MBCT), have the potential in improving psychological health in older people. With the growing older people population, there is a need for greater social welfare capacity to promote their well-being. The project aims to:

1. Evaluate the effectiveness of MBCT in improving mental health and mindfulness in older people with depressive symptoms as compared to care as usual;
2. Compare the effectiveness between MBCT led by mindfulness teacher and that led by social workers;
3. Examine psychological flexibility as a potential mechanism of change in MBCT for depressive symptoms.

Depression is one of the most common yet under-recognized mental disorders in older adults in Hong Kong, and it is estimated that approximately one in 10 older people has clinically significant depression. With population aging, the number of older people with depression is slated to double in the next two decades, creating a substantial burden on the individuals, caregivers, and health care system. While pharmacological interventions are effective in reducing depression, medical risks can be complicated due to polypharmacy in older people. Non-pharmacological interventions may benefit the population by addressing the underlying dysfunctional cognitive processes associated with depression.

Mindfulness-based interventions, such as mindfulness-based cognitive therapy (MBCT), have the potential in improving psychological health in older people. MBCT is a group intervention originally designed to prevent recurrent depressive disorders. It combines mindfulness practices and cognitive-behavioural elements to enhance an individual's understanding of the interacting relationships among thoughts, emotions, bodily sensations, and behaviours. Mindfulness practice emphasizes on developing a moment-to-moment, non-judgmental awareness and may be helpful in alleviating depression by directing individual's attention to the present instead of ruminating in the past. Systematic reviews have shown the efficacy of MBCT in reducing depression, anxiety, loneliness, stress, sleep problems, ruminations, general mood, and positive affect. However, over half of the included studies lacked a control group and mixed findings were observed possibly because of inconsistent modifications to the protocol, methodological flaws, and study limitations.

The application of MBCT in the Chinese older population is understudied. Recently, a randomized controlled trial on MBCT for older people were conducted in Hong Kong. By comparing a standard MBCT to an active control group (physical exercise + health education) for older people with depression, it has been found that while both groups showed a reduction in the severity of depressive symptoms, only the MBCT group showed improvement in mindfulness.

With these promising findings, more studies are needed to establish the evidence base for the intervention and inform clinical practice in this population. The investigators aim to explore whether a modified MBCT based on older people's feedback can reduce depressive symptoms and improve mindfulness. With the growing older people population and thus a need for greater social welfare capacity to promote their well-being, the investigators will also examine whether a modified MBCT led by social workers under the supervision of a mindfulness teacher can benefit the population.

Inclusion Criteria:

• 60 years or older
• have depressive symptoms of mild level or above, as indicated by scoring 5 or more in PHQ-9
• can give informed consent to participate

Exclusion Criteria:

• known history of autism, intellectual disability, schizophrenia-spectrum disorder, bipolar disorder, Parkinson's disease, or dementia
• imminent suicidal risk
• difficulty in communication